SLP-25 model slotted plate is suitable for standard optic mounts with M6 mounting holes. They have M6 CBR slots from bottom.
SLP-75 model slotted plate has two M6 slot and one M6 C’bored hole suitable for our standard post with M6 mounting hole. This slotted plate helps us to arrange a twin mirror set up or a special small optical bench with a restricted space limit.
SLP-275 model comes with two M6 CBR slots opposite to each other. We can use this when the optical path is far from the mounting.